--  @testpoint:opengauss关键字character(非保留)，作为函数名
--关键字不带引号-预期报错
drop function if exists character;
create function character(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
--清理环境
drop function character;

--关键字带双引号-成功
drop function if exists "character";
create function "character"(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
--清理环境
drop function "character";

--关键字带单引号-合理报错
drop function if exists 'character';
create function 'character'(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/

--关键字带反引号-合理报错
drop function if exists `character`;
create function `character`(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/